Cisco IronPort AsyncOS Software for Cisco Web Security Appliance is affected by the following vulnerabilities:

Two authenticated command injection vulnerabilities

Management GUI Denial of Service Vulnerability

These vulnerabilities are independent of each other; a release that is
affected by one of the vulnerabilities may not be affected by the
others.

Successful exploitation of any of the two command injection vulnerabilities could allow an authenticated,
remote attacker to execute arbitrary commands on the underlying
operating system with elevated privileges.
Successful exploitation of the Management GUI Denial of Service Vulnerability could cause several critical processes to become
unresponsive and make the affected system unstable.

Determining the Running Software Version

To determine whether a vulnerable version of Cisco IronPort AsyncOS
Software for Cisco Web Security is running on an appliance, administrators can issue the version command. The following example shows a device running Cisco IronPort AsyncOS Software version 7.5.1-079:

The Cisco Web Security Appliance is a secure web gateway that combines advanced malware protection, application visibility and control (AVC), acceptable use policy controls, reporting, and secure mobility on a single platform.

Authenticated Command Injection Vulnerabilities

Two vulnerabilities in the web framework code could allow an authenticated, remote attacker to to execute arbitrary
commands on the underlying operating system with elevated privileges.

The vulnerabilities are due to the failure to properly sanitize user
supplied input that is utilized to perform actions that
leverage the underlying command-line interface of the device. An
authenticated, unprivileged attacker could exploit this vulnerability
by sending a crafted URL to the affected system or convince a
valid user to click on a malicious URL. An successful exploit could allow the
attacker to take complete
control of the affected device.

These vulnerabilities can only be triggered by IPv4 traffic directed to the management IP addresses of the affected system.
These vulnerabilities can be exploited over the default management ports, TCP port 8080 or TCP port 8443.

Note: The default management ports can be reconfigured on the system.

These vulnerabilities are documented by Cisco bug IDs CSCzv69294 (registered customers only) and CSCzv85726 (registered customers only) and have been assigned Common Vulnerabilities and Exposures (CVE) IDs CVE-2013-3383 and CVE-2013-3384.

Management GUI Denial of Service Vulnerability

A vulnerability in the Graphical User Interface (GUI) function in the web framework code could allow an unauthenticated,
remote attacker to cause multiple processes to become unresponsive, resulting in a denial of service condition.

The vulnerability is due to
improper handling, processing and termination of HTTP and HTTPS connections. An attacker could exploit this vulnerability by
sending multiple HTTP or HTTPS requests to any management enabled interfaces of
the affected system. A full TCP three-way handshake is required to
exploit this vulnerability. An exploit could allow the attacker prevent management access via the GUI and cause other critical process to become unresponsive, resulting in a denial of service condition. A hard reboot of the affected system is needed to restore full functionality.

This vulnerability can only be triggered by IPv4 traffic directed to the
management IP addresses of the affected system. This vulnerability can
be exploited over the default management ports, TCP port 8080 or TCP port 8443.

Note: The default management ports can be reconfigured on the system.

This vulnerability is documented by Cisco bug IDCSCzv58669 (registered customers only) and has been assigned CVE ID CVE-2013-3385.

Successful exploitation of any of the two command injection vulnerabilities could allow an authenticated,
remote attacker to execute arbitrary commands on the underlying
operating system with elevated privileges.
Successful exploitation of the Management GUI Denial of Service Vulnerability could cause several critical processes to become
unresponsive and make the affected system unstable.

When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

The following table lists the first fixed releases that contain fixes for the two authenticated command injection vulnerabilities:

Major Release

First Fixed In

7.1 and prior

7.1.3-033 and 7.1.4-101

7.5

7.5.0-838

7.7

7.7.0-550

The following table list the first fixed releases that contain fixes
for the Management GUI Denial of Service Vulnerability:

Major Release

First Fixed In

7.1 and prior

7.1.3-033 and 7.1.4-101

7.5

7.5.0-838 and 7.5.1-201

7.7

7.7.0-602

The following table lists the recommended releases that include fixes for all the vulnerabilities in described in this security advisory:

All the vulnerabilities described in this security advisory can be mitigated by
disabling management access to the affected system GUI.
Administrators can use the interfaceconifg command to disable appliance management via the GUI. Alternatively, this can be done via the
GUI by editing the management interface properties under Network->IP
interfaces-> Edit and then selecting Disable Appliance Management.
Note: Administrators can manage the affected system via SSH and command-line interface while GUI access is
disabled. However, not all commands and features may be available via command-line interface.

Administrators can also limit the attack surface by restricting IP
addresses that can access the management interface. This can be
done using the adminaccessconfig command and selecting IPACCESS from the menu.

Administrator should also implement Cross-Site Request Forgery protection if available on their platform and software release. This will help limit the attack surface of the command injection vulnerabilities, although will not completely eliminate them.

Cisco has released free software updates that address the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):

+1 800 553 2447 (toll free from within North America)

+1 408 526 7209 (toll call from anywhere in the world)

e-mail: tac@cisco.com

Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

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